tests: add chrt vs. nice test

Signed-off-by: Karel Zak <kzak@redhat.com>

tests/expected/schedutils/chrt-non-root-batch-vs-nice

@@ -0,0 +1,3 @@
+<removed> (process ID) old priority 0, new priority 5
+SCHED_BATCH
+0

tests/ts/schedutils/chrt-non-root

@@ -0,0 +1,61 @@
+#!/bin/bash
+#
+# This file is part of util-linux.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This file is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+TS_TOPDIR="${0%/*}/../.."
+TS_DESC="chrt-non-user"
+
+. $TS_TOPDIR/functions.sh
+ts_init "$*"
+
+ts_check_test_command "$TS_CMD_CHRT"
+
+# TODO: drone.io does not like FIFO and RR (container restriction?)
+TS_KNOWN_FAIL="yes"
+
+function do_chrt {
+	$TS_CMD_CHRT $* $TS_CMD_CHRT --pid 0 | sed 's/.* policy: //; s/.* priority: //' &>> $TS_OUTPUT
+}
+
+function skip_policy {
+	$TS_CMD_CHRT --max | grep $1 | grep 'priority' &> /dev/null
+	if [ $? == 1 ]; then
+		ts_skip_subtest "unsupported"
+		return 1
+	fi
+	return 0
+}
+
+function cleanup_output {
+	sed -i -e 's/pid [0-9]*/<removed>/' $TS_OUTPUT
+	sed -i -e 's/[0-9]* (process/<removed> (process/' $TS_OUTPUT
+}
+
+ts_init_subtest "batch-vs-nice"
+skip_policy SCHED_BATCH
+if [ $? == 0 ]; then
+	renice -n 5 -p $$ &>> $TS_OUTPUT
+	do_chrt --batch 0
+	cleanup_output
+	ts_finalize_subtest
+fi
+
+# failed -- let's report kernel limits
+#
+if [ $TS_NSUBFAILED -ne 0 ]; then
+	echo "Supported policies:"
+	$TS_CMD_CHRT --max
+fi
+
+ts_finalize